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ASTM A320

ASTM A320 Specifications

Atlanta Rod & Manufacturing, Inc., has been manufacturing anchor bolts, embeds, headed bolts and construction fasteners to customer specifications since 1981. With 120,000 square feet of manufacturing space we have the ability to supply large scale heavy construction projects as well as small same day specials.

ASTM A320

The ASTM A320 specification covers alloy steel and stainless steel bolting materials for low temperature service. This standard covers rolled, forged, or strain hardened bars, bolts, screws, studs, and stud bolts used for pressure vessels, valves, flanges, and fittings. Like the ASTM A193 specification, unless otherwise specified, the 8UN thread series is specified on fastener larger than 1” in diameter.

GRADES
ASTM A320 L7 Alloy steel AISI 4140/4142 Quenched and tempered
ASTM A320 L43 Alloy steel AISI 4340 Quenched and tempered
ASTM A320 B8 Class 1 Stainless steel AISI 304, carbide solution treated
ASTM A320 B8M Class 1 Stainless steel AISI 316, carbide solution treated
ASTM A320 B8 Class 2 Stainless steel AISI 304, carbide solution treated, strain hardened
ASTM A320 B8M Class 2 Stainless steel AISI 316, carbide solution treated, strain hardened

 

A320 MECHANICAL PROPERTIES

Grade Size Tensile, ksi min Yield, ksi, min Charpy Impact  Elong, % min RA, %, min
L7  up to 21/2  125  105  -150° F  16 50
 L43 sup a 4  125  105 -150° F  16 50
 B8 Class 1  all  75  30  N/A  30 50
B8M Class 1  all  75  30  N/A  30 50
B8 Class 2 Up to 3/4 125  100  N/A  12 35
 7/8 – 1  115  80  N/A  15  35
11/8 – 11/4  105  65  N/A  20  35
13/8 – 11/2  100  50  N/A  28 45
 B8M Class 2  Up to 3/4  110  95  N/A  15  45
7/8 – 1  100  80  N/A  20  45
11/8 – 11/4  95  65  N/A  25  45
 13/8 – 11/2  90  50  N/A

 

A320 CHEMICAL PROPERTIES

Element L7 (AISI 4140) L43 (AISI 4340) B8 (AISI 304) B8M (AISI 316)
Carbon 0.37 – 0.49% 0.38 – 0.43% 0.08% max 0.08% max
Manganese 0.65 – 1.10% 0.75 – 1.00% 2.00% max 2.00% max
Phosphorus, max 0.04% 0.04% 0.05% 0.05%
Sulfur, max 0.04% 0.04% 0.03% 0.03%
Silicon 0.15 – 0.35% 0.15 – 0.35% 1.00% max 1.00% max
Chromium 0.75 – 1.20% 0.70 – 0.90% 18.0 – 20.0% 16.0 – 18.0%
Nickel 1.65 – 2.00% 8.0 – 11.0% 10.0 – 14.0%
Molybdenum 0.15 – 0.25% 0.20 – 0.30% 2.00 – 3.00%

See Also: ASTM A320 Specifications on ASTM.org.

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